Remove unused variables and such. No functional changes.

src/lib/commands/cede.c

@@ -200,7 +200,6 @@ grab_sect(register struct sctstr *sp, natid to)
     struct plnstr *pp;
     struct lndstr *lp;
     struct nukstr *np;
-    int oldche;
     struct nstr_item ni;
     struct plnstr p;
     struct lndstr l;

src/lib/commands/spy.c

@@ -74,7 +74,6 @@ spy(void)
     int i;
     coord *table;		/* sectors already seen */
     int t_len = 0;
-    int vec[I_MAX + 1];
     int nrecon;
     int nunits;
     struct nstr_sect nstr;

src/lib/commands/work.c

@@ -125,7 +125,6 @@ work(void)
 static int
 buildeff(struct sctstr *sp, int work, double *money)
 {
-    int vec[I_MAX + 1];
     register int work_cost;
     int n, hcms, lcms;
     int effdone = 0;